<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>4flex</title>
    <link rel="stylesheet" href="flex4.css">
</head>

<body>
    <div class="box">
        <div class="column">
            <span class="item"></span>
            <span class="item"></span>
        </div>
        <div class="column">
            <span class="item"></span>
            <span class="item"></span>
        </div>
    </div>
</body>

</html>